JPS5943804A - Cooling plate for body of blast furnace - Google Patents

Abstract

PURPOSE:To obtain a cooling plate having high durability by applying an Ni metallic layer and further Cr or Cr carbide layer on the outside surface of the cooling plate which is disposed on the inside surface of a shell and is designed to be passed internally with cooling water. CONSTITUTION:A layer 2 of Ni, Ni-Fe, Ni-P, Ni-W, Ni-Al, etc. is mounted on the top surface of a body 1 of a cooling plate made of copper or a copper alloy by means such as plating, melt spraying or the like. A Cr or Cr carbide layer 3 is then mounted on the top surface thereof. There are melt spraying and electroplating methods in this mounting method; a plasma melt spraying method is preferably used in the case of the melt spraying and baths of chromate and the chromate incorporated with oxalic acid are preferably used in the case of Cr and Cr carbide respectively. If the layers 2, 3 are subjected to a heat treatment after the application thereof, diffusion arises between the body 1 and the layers 2, 3, thereby developing the much securer bond between both and making the layer 3 itself rigid.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a cooling plate for cooling a furnace body of a blast furnace.

One method of cooling the furnace body to extend the life of the side wall bricks of a blast furnace and to maintain the integrity of the steel shell is to install a cooling plate inside the steel shell through which cooling water is passed. Since most of the cooling plates used are made of copper or its alloys,
If the brick inside the furnace body is damaged and exposed inside the furnace,
Copper or its alloys have a low melting point and low mechanical strength, so they break and have to be replaced.

The present invention aims to provide a cooling board that eliminates the above-mentioned drawbacks, and the gist thereof is to apply nickel or nickel alloy N to the outer surface of a cooling board body made of copper or copper alloy,
This is a furnace body cooling plate for a blast furnace, characterized in that a chromium or beam shim carbide layer is further applied on the upper surface thereof.

The present invention will be explained in detail with reference to the drawings below. Figures 1 and 2 show an overall schematic view of the zero-core cooling plate, and an enlarged cross-sectional view of its main parts is shown in Figure 6, and Figure 3. In this step, nickel, nickel-iron, nickel-phosphorus, nickel-tungsten, nickel-aluminum (2), etc. are attached to the upper surface of the cooling plate body (1) made of copper or steel alloy by plating, thermal spraying or other means.

In this case, the thickness is 10 to 500 μm, and the mounting method is not particularly limited, but it is preferable to use a plating method in view of the fact that the adhesive strength is high.

Next, a chromium or chromium carbide layer (6) is applied to the top surface.
Attach it to a thickness of 50 to 800 μm as much as possible. There are two methods for attaching this chromium or chromium carbide: thermal spraying and electroplating. In the case of thermal spraying, plasma spraying is preferable, and in the case of electroplating, chromium or chromium carbide is preferable. In this case, it is preferable to use a bath containing chromate containing shiulic acid, and to use an electroplating method in terms of thickness adjustment and adhesion.

After installing the nickel or nickel alloy layer (2) and the chromium or chromium carbide layer (3) in this way,
If heat treatment is performed at ~1000℃ for 1 to 6 hours,
Diffusion occurs between the cooling plate body and the nickel or nickel alloy layer, and between the nickel or nickel alloy layer and the chromium or chromium carbide layer, and the three particles are firmly bonded to each other through the diffusion layer formed there. In the case of W (especially thermal spraying), -JW is desirable because the n itself becomes strong with buds, but since the cooling plate itself of the present invention is used in a state where it is heated during subsequent use, the above heat treatment is necessary. Even if this heat treatment is not carried out, the result will be the same shape as if the heat treatment had been carried out.

As described above, according to the cooling plate of the present invention, a hard chromium layer ( Hv
500-900) or chromium carbide layer (H71000-2
Since the nickel or nickel alloy is interposed as an intermediate layer to attach the nickel or nickel alloy, the nickel or nickel alloy layer is strongly bonded to the two, resulting in a surface layer that is highly heat resistant, corrosion resistant, and wear resistant. It will be firmly bonded, and if you apply the above heat treatment before use, you can use it without any special heat treatment and the cooling board body and name btt W
4 A diffusion layer is formed between each layer, which has the effect of further increasing the bonding strength of the wire and making it highly durable.

[Brief explanation of drawings]

FIG. 1 is a partially cutaway plan view of the furnace body cooling plate, FIG. 2 is a side view of the same, and FIG. 3 is an enlarged sectional view of the main part. In the figure, (1)...Cooling plate body (2)...Nickel or nickel alloy layer (3)...
... Chromium or chromium carbide layer Figure 2 Figure 1 Figure 3 Procedural amendments to the amendments to the procedures filed by Kazuo Wakasugi, Director General of the Japan Patent Office, January 2011 1, Indication of the case 1982 Patent order No. 1542i3 No. 2,
Name of the invention: Blast furnace cooling plate 3, relationship to the case of the person making the amendment Patent Applicant address and name: Mishima Kosan Co., Ltd.

Claims (1)

[Claims] 1. A furnace body cooling plate for a blast furnace, characterized in that a nickel or nickel alloy layer is applied to the outer surface of the cooling plate main body made of copper or copper alloy, and a chromium or chromium carbide layer is further applied to the upper surface of the nickel or nickel alloy layer.